Slide-valve



N0. 62|,93|- Patented Mar. 28, I899. C J MELLIN SLIDE VALVE.

(A pl 1; flldAp 23 1898) (No Model.)

w //v VENTOP WITNESSES:

ATTORNEY.

Patented Ma r. 28, I899.

C J MELLIN SLIDE .VALVE.

(Application med Apr. 28, 189B.)

2 $heets-$heet 2.

(No lhdal.)

w BY

- ATTORNEY the Valve being in the middle position.

Ihvrmnn STATES CARL J. MELLIN, OF

RICHMOND, VIRGINIA SLIDE-VALVE.

SPECIFICATION forming part of Letters Application filed April 23, 1898.

T0 aZZ whom it may concern:

Be it known that I, CARL J. MELLIN, a citizen of the United States, and a resident of Richmond, in the county of Henrico and'State of Virginia, have invented certain new and useful Improvements in Slide-Valves for Motor-Engines, of which the following is a specification.

My invention consists of an improvement .of the valve known as the Allen valve,

whereby there is a double opening of exhaust when the valve begins to exhaust and for a short time thereafter same, as there is double opening for the admission of steam with said valve as ordinarily constructed, and thus the cylinder is more effectively exhausted when the piston begins its stroke, which facilitates high speed, as hereinafter fully described, reference being made to the accompanying drawings, in which Figure 1 is a sectional elevation of a flat D- valve and the port-face of the cylinder, showing the valve as moving to the right hand to exhaust the right-hand steam-port and admit steam to the left-hand port. Fig. 2 is .a like section showing the valve at the point of opening the left-hand steam-port both at the left-hand end of the port and at the righthand end of the Allen passage through the valve. Fig. 3 is a like section showing the valve as returning to the left hand after the right-hand port has been exhausted to exhaust the left-hand port and admit steam to the right-hand port and showing one exhaust opening directly into the exhaust-cavity of the valve and another exhaust through the Allen passage and the mouth of the previously-exhausted right-hand port into the exhaust-cavity, this being the operation due to my improvement of the valve. Fig. 4 is a longitudinal sectional elevation of a half portion of a piston-valve, showing the application of the invention to such valves as well, with steam-inlets at ends of the valve and exhaust at the middle, same as the fiat valve, Fig. 5 is a like half-section. of a piston-valve with the exhaust-passages at the ends and steaminlet at the middle and showing the beginning of the exhaust at the right hand. Fig.

6 is a section of the lower half of the same valve as shown in Fig. 5, showing the cut- Patent No. 621,931, dated March 28, 1899.

$eria1Nb. 678,574. (No model.)

off in moving to the right; and Fig. 7 is a transverse section on line 2 2, Fig. 5.

A represents the slide-valve, having the ordinary Allen passage 19 from one face to the other over the exhaust-cavity d.

e and f represent the steam-ports, and g the exhaust-port, in the cylinder port-face 7n The function of the passage 7) is well understood, the same being, as before stated, to open double passage for the steam at the beginning of the inlet; but beyond this its operation. isthe same as any other slide-valve owing to the fact that as heretofore constructed the part of each valve-face a between the mouth of the passage 1) and the exhaustcavity has been made as wide asor wider than the steam-port, so that the whole breadth of the steam-port is covered prior to or at the moment of the opening of the exhaust. Now

narrower than the steam-port, whereby there is at and for some time after the direct opening of the exhaust at j another opening at into passage 1), and thence through the mouth of the already-exhausted steam-port at the other end into the exhaust-cavity, as indi cated by the arrow Z, whereby there is double opening ofexhaust at the beginning,and there is also exhaust from in front of the piston just before it reaches the end of the stroke, which with all other slide-valves is out off some time before the end of the stroke. Thus with the adjustment of the valve to open the exhaust a short time before the. piston reaches the ends of its stroke there is complete discharge of steam at the beginning of the reverse movement of the piston.

In the piston-valve the application of the invention is practically the same with only such modifications of the valve and valve-caseas the nature of the diiferent form of valve requires. A represents the valve. It has the same Allen passage 1) from one face 0 to another over the exhaust-cavity d. e and f represent the steam-ports, and g the exhaustport, the steam being admitted at z' to the ends of the valve, or the exhaust may be from the ends of the Valve through zand be admitted through g.

I claim- In a slide-valve having the passage 1), from one to the other of the valve-faces 0 past the I construct this portion of the valve-face c' ICO exhaust-cavity, the parts of said faces a, beviously-exhausted steam -port substantially tween the mouths of said passage and the eX- as described. haust-cavity being of less breadth than the i r breadth of the steam ports respectively MELLIB' 5 whereby during the fore part of the opening lVitnesses:

of direct exhaust there is also exhaust through A. P. THAYER, passage 1), and the mouth of the opposite pre- 0. SEDGWICK. 

